I meant billboards which we can generate as LOD but when I look closer I think that fog have the influence on it (I have low LOD distance for trees). Anyway I have on some models flat planes with textures and when fog is active I think that they are too bright/visible than another parts of model. You can see it in screen below or here: http://www.youtube.com/watch?v=z7TaAcHUcZA at 1:56.

I'm not sure but in WE you use Sky.frac and Sky.atmosphericDensityExponent? Please try FogDraw function. I use this one and on both render mode - RM_CLOUD and RM_BLEND I have this issue. Is this because of some limitations of local fog?